#include <iostream>

// prototype declarations
double square(double);
double half(double);
void printit(double);

int main(void)
{
    //local variables go here
    double x;
    
    x=4.;

    printit(square(x));
    // same as cout << square(4.) << endl;
    printit(half(x));
    printit(half(square(7.)));
    printit(square( half(x)+sqrt(9) ));
    printit(square(sqrt(3434.34)));
}


// function declarations

double square(double x)
{
    return x*x;
}


double half(double x)
{
    return x/2.;
}

void printit(double y)
{
    cout << "The value is " << y << endl;
}